Year	Percent
1998-01-01	36.7877
1999-01-01	38.1347
2000-01-01	31.2000
2001-01-01	21.9000
2002-01-01	30.6716
2003-01-01	23.6619
2004-01-01	31.3308
2005-01-01	29.5203
2006-01-01	30.8284
2007-01-01	40.7373
2008-01-01	27.3716
2009-01-01	26.2423
2010-01-01	39.3815
2011-01-01	37.8618
2012-01-01	45.0949
2013-01-01	44.8241
2014-01-01	54.8987
2015-01-01	48.1398
2016-01-01	46.7813